for about the same price you can get a Winnebago, Tiffin, Newmar, or Forest River product. The ACE is a Thor product, and Thor stuff is known industry wide for having issues with slideout and leveling jack problems. We get them in daily.
BTW, Winnebago actually mounts their front chairs to steel and has the whole front "A to B" pillar section made of steel. All others use fiberglass and wood in this area. Winnebago also uses a 1 piece fiberglass roof.
Actually I hope you find the product you like and have the best luck with it (regardless of brand name). If its ACE, then go buy an ACE. I just hope you enjoy whatever you buy.